mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 05:46:40 +07:00
2378bc09b9
We now timeout also if the state machine does not change within the given time. For that, the driver-specific completion-functions are extended to return true or false depending on the timeout. This then gets checked in the algorithm. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
226 lines
5.5 KiB
C
226 lines
5.5 KiB
C
/*
|
|
* i2c-pca-isa.c driver for PCA9564 on ISA boards
|
|
* Copyright (C) 2004 Arcom Control Systems
|
|
* Copyright (C) 2008 Pengutronix
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/isa.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/i2c-algo-pca.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
|
|
#define DRIVER "i2c-pca-isa"
|
|
#define IO_SIZE 4
|
|
|
|
static unsigned long base;
|
|
static int irq = -1;
|
|
|
|
/* Data sheet recommends 59kHz for 100kHz operation due to variation
|
|
* in the actual clock rate */
|
|
static int clock = 59000;
|
|
|
|
static struct i2c_adapter pca_isa_ops;
|
|
static wait_queue_head_t pca_wait;
|
|
|
|
static void pca_isa_writebyte(void *pd, int reg, int val)
|
|
{
|
|
#ifdef DEBUG_IO
|
|
static char *names[] = { "T/O", "DAT", "ADR", "CON" };
|
|
printk(KERN_DEBUG "*** write %s at %#lx <= %#04x\n", names[reg],
|
|
base+reg, val);
|
|
#endif
|
|
outb(val, base+reg);
|
|
}
|
|
|
|
static int pca_isa_readbyte(void *pd, int reg)
|
|
{
|
|
int res = inb(base+reg);
|
|
#ifdef DEBUG_IO
|
|
{
|
|
static char *names[] = { "STA", "DAT", "ADR", "CON" };
|
|
printk(KERN_DEBUG "*** read %s => %#04x\n", names[reg], res);
|
|
}
|
|
#endif
|
|
return res;
|
|
}
|
|
|
|
static int pca_isa_waitforcompletion(void *pd)
|
|
{
|
|
long ret = ~0;
|
|
unsigned long timeout;
|
|
|
|
if (irq > -1) {
|
|
ret = wait_event_interruptible_timeout(pca_wait,
|
|
pca_isa_readbyte(pd, I2C_PCA_CON)
|
|
& I2C_PCA_CON_SI, pca_isa_ops.timeout);
|
|
} else {
|
|
/* Do polling */
|
|
timeout = jiffies + pca_isa_ops.timeout;
|
|
while (((pca_isa_readbyte(pd, I2C_PCA_CON)
|
|
& I2C_PCA_CON_SI) == 0)
|
|
&& (ret = time_before(jiffies, timeout)))
|
|
udelay(100);
|
|
}
|
|
return ret > 0;
|
|
}
|
|
|
|
static void pca_isa_resetchip(void *pd)
|
|
{
|
|
/* apparently only an external reset will do it. not a lot can be done */
|
|
printk(KERN_WARNING DRIVER ": Haven't figured out how to do a reset yet\n");
|
|
}
|
|
|
|
static irqreturn_t pca_handler(int this_irq, void *dev_id) {
|
|
wake_up_interruptible(&pca_wait);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct i2c_algo_pca_data pca_isa_data = {
|
|
/* .data intentionally left NULL, not needed with ISA */
|
|
.write_byte = pca_isa_writebyte,
|
|
.read_byte = pca_isa_readbyte,
|
|
.wait_for_completion = pca_isa_waitforcompletion,
|
|
.reset_chip = pca_isa_resetchip,
|
|
};
|
|
|
|
static struct i2c_adapter pca_isa_ops = {
|
|
.owner = THIS_MODULE,
|
|
.algo_data = &pca_isa_data,
|
|
.name = "PCA9564/PCA9665 ISA Adapter",
|
|
.timeout = HZ,
|
|
};
|
|
|
|
static int __devinit pca_isa_match(struct device *dev, unsigned int id)
|
|
{
|
|
int match = base != 0;
|
|
|
|
if (match) {
|
|
if (irq <= -1)
|
|
dev_warn(dev, "Using polling mode (specify irq)\n");
|
|
} else
|
|
dev_err(dev, "Please specify I/O base\n");
|
|
|
|
return match;
|
|
}
|
|
|
|
static int __devinit pca_isa_probe(struct device *dev, unsigned int id)
|
|
{
|
|
init_waitqueue_head(&pca_wait);
|
|
|
|
dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);
|
|
|
|
#ifdef CONFIG_PPC
|
|
if (check_legacy_ioport(base)) {
|
|
dev_err(dev, "I/O address %#08lx is not available\n", base);
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
|
|
dev_err(dev, "I/O address %#08lx is in use\n", base);
|
|
goto out;
|
|
}
|
|
|
|
if (irq > -1) {
|
|
if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) {
|
|
dev_err(dev, "Request irq%d failed\n", irq);
|
|
goto out_region;
|
|
}
|
|
}
|
|
|
|
pca_isa_data.i2c_clock = clock;
|
|
if (i2c_pca_add_bus(&pca_isa_ops) < 0) {
|
|
dev_err(dev, "Failed to add i2c bus\n");
|
|
goto out_irq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_irq:
|
|
if (irq > -1)
|
|
free_irq(irq, &pca_isa_ops);
|
|
out_region:
|
|
release_region(base, IO_SIZE);
|
|
out:
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int __devexit pca_isa_remove(struct device *dev, unsigned int id)
|
|
{
|
|
i2c_del_adapter(&pca_isa_ops);
|
|
|
|
if (irq > -1) {
|
|
disable_irq(irq);
|
|
free_irq(irq, &pca_isa_ops);
|
|
}
|
|
release_region(base, IO_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct isa_driver pca_isa_driver = {
|
|
.match = pca_isa_match,
|
|
.probe = pca_isa_probe,
|
|
.remove = __devexit_p(pca_isa_remove),
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = DRIVER,
|
|
}
|
|
};
|
|
|
|
static int __init pca_isa_init(void)
|
|
{
|
|
return isa_register_driver(&pca_isa_driver, 1);
|
|
}
|
|
|
|
static void __exit pca_isa_exit(void)
|
|
{
|
|
isa_unregister_driver(&pca_isa_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
|
|
MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(base, ulong, 0);
|
|
MODULE_PARM_DESC(base, "I/O base address");
|
|
|
|
module_param(irq, int, 0);
|
|
MODULE_PARM_DESC(irq, "IRQ");
|
|
module_param(clock, int, 0);
|
|
MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t"
|
|
"For PCA9564: 330000,288000,217000,146000,"
|
|
"88000,59000,44000,36000\n"
|
|
"\t\tFor PCA9665:\tStandard: 60300 - 100099\n"
|
|
"\t\t\t\tFast: 100100 - 400099\n"
|
|
"\t\t\t\tFast+: 400100 - 10000099\n"
|
|
"\t\t\t\tTurbo: Up to 1265800");
|
|
|
|
module_init(pca_isa_init);
|
|
module_exit(pca_isa_exit);
|